Résultats de la recherche
-
Natural mortality rates of the Antarctic krill Euphausia superba Dana in the Indian sector of the Southern Ocean
Abstract: Data on the size and age composition of Euphausia superba were collected in the ... Cooperation and Cosmonaut Seas from 1985 to 1990. The coefficients of instantaneous natural mortality of ... E.superba in the Indian sector of the Southern Ocean were calculated according to Alverson-Carney’s (1975 ... 0.59 and from 0.94 to 2.30, respectively. The estimation of the annual extinction rate of E. superba ...
Meeting Document : WG-KRILL-93/44 : Auteur(s): E.A. Pakhomov (Ukraine)
-
An interpretation of the growth of the Adelie penguin rookery at Cape Royds, 1955-1990
Abstract: The population dynamics of the Cape Royds rookery were modelled by computer, in order ... to determine the probable causes of the dramatic increase since 1980 in the numbers of Adelie ... penguins, Pygoscelis adeliae, breeding in the Ross Sea region, Antarctica. Variations in the extent of sea ... and decreases adult mortality. The timing of the event is critical and rules out the cessation of ...
Meeting Document : WG-CEMP-92/21 : Auteur(s): N. Blackburn (Denmark), R.H. Taylor and P.R. Wilson (New Zealand)
-
Ross Sea Biodiversity, Part I: validation of the 2007 CCAMLR Bioregionalisation Workshop results towards including the Ross Sea in a representative network of marine protected areas in the Southern Ocean
Abstract: This report provides the scientific basis, validating the results of the CCAMLR ... Bioregionalization Workshop (2007) as well as the report of ASOC (2010), for identifying the Ross Sea as one of 11 ... areas deserving close scrutiny for inclusion in a network of marine protected areas. CCAMLR (2007 ... ) identified the Ross Sea as an area of high biodiversity on the basis of its high physical heterogeneity; ASOC ...
Meeting Document : WG-EMM-10/11 : Auteur(s): D.G. Ainley, G. Ballard and J. Weller (USA)
-
Further analysis of spatial patterns of benthic invertebrate habitats from fishery bycatch in the Ross Sea region
presence of VME taxa bycatch are identifiable, as are several areas of dense fishing effort with no ... evidence of VME taxa. Identifiable sponge and/or gorgonian habitats occurred at a typical scale of 10-30 km ... , but were at larger scales. Spatial analysis of these data allows the detectability of prevalent taxa ... to be estimated, along with changes in catch rate at different levels of observed bycatch. Results ...
Meeting Document : WG-FSA-10/30 : Auteur(s): S.J. Parker, R.G. Cole and S.M. Hanchet (New Zealand)
-
Abundance and reproductive distribution of Pygoscelids sp. in the northern area of Danco Coast, Antarctic Peninsula
Abstract: Studies related to the abundance and reproductive distribution of marine birds have the ... potential to act as ecological indicators. The western Antarctic Peninsula is one of the three sites in the ... world with some of the clearest signals of climate warming. The aim of this study was to monitor the ... distribution and abundance of breeding populations of chinstrap penguin (Pygoscelis antarctica) and gentoo ...
Meeting Document : WG-EMM-12/58 : Auteur(s): M.M. Santos, E.F. Rombolá, D. González-Zevallos, M.A. Juáres, J. Negrete and N.R. Coria (Argentina)
-
Results of a CCAMLR-sponsored research survey to monitor abundance of pre-recruit Antarctic toothfish in the southern Ross Sea, February 2012
Abstract: At its 2011 meeting, the Scientific Committee agreed that a time series of relative ... endorsed a proposal to carry out this work once the fishery had closed at the end of the 2011/12 season ... . The survey had two main objectives: (i) To establish the feasibility of developing a time series of ... longline surveys to monitor pre-recruit (<100 cm TL) toothfish in the south of SSRUs 881.J and 881.L in ...
Meeting Document : WG-FSA-12/41 : Auteur(s): S.M. Hanchet, S. Mormede, S. Parker, A. Dunn (New Zealand) and H.-S. Jo (Republic of Korea)
-
Investigation of potential biases in the assessment of Antarctic toothfish in the Ross Sea fishery using outputs from a spatially explicit operating model
-recapture data, and rely on the assumption that tagged and untagged fish have constant probabilities of ... recapture regardless of the spatial distribution of releases or subsequent fishing effort for recaptures ... that fishing effort for recaptures is distributed in proportion to the underlying abundance. Neither of ... these conditions are likely to occur in practice, and violation of this assumption may lead to bias. In ...
Meeting Document : WG-SAM-13/36 : Auteur(s): S. Mormede and A. Dunn (New Zealand)
-
The 2013 annual random stratified trawl survey to estimate the abundance of Dissostichus eleginoides and Champsocephalus gunnari in the waters of Heard Island (Division 58.5.2)
(HIMI) was completed during April of 2013. The catches of D. eleginoides for 2013 were half that of 2012 ... times the long term average. Catches of Channichthys rhinoceratus were higher and those of ... take. The catch of invertebrates in the 2013 survey was 6 t, which was lower than the long term average ... . This year there was a large abundance of jellyfish (Cnidaria) which formed about half of the catch of ...
Meeting Document : WG-FSA-13/21 : Auteur(s): G.B. Nowara, T.D. Lamb and D.C. Welsford (Australia)
-
An overview of the elasmobranch fish of the Southern Ocean
Abstract: This review summarises current knowledge of the elasmobranch fish occurring in the ... Antarctic and sub-Antarctic waters of the CCAMLR area. About 14–15 species of elasmobranch have been ... recorded, with skates (Rajiformes) the most speciose order. Two genera of skates are known (Amblyraja and ... Bathyraja), although the current taxonomic knowledge of some species or species-groups is incomplete. Five ...
Meeting Document : WG-FSA-13/28 : Auteur(s): J.R. Ellis, S.R. McCully, V.V. Laptikhovsky and R. Scott (United Kingdom)
-
Estimation and correction of migration-related bias in the tag-based stock assessment of Patagonian toothfish in Division 58.5.2
Abstract: Migration has the potential to violate the assumptions of tag recapture models used in ... the assessment of toothfish stocks. Evaluating the potential bias introduced into stock assessments ... and tag-based biomass estimates when the distributions of tagged fish, fishing effort and the ... underlying stock distribution are spatially heterogeneous is currently one of the highest priorities of the ...
Meeting Document : WG-SAM-17/11 : Auteur(s): P. Burch, P. Ziegler, D. Welsford and C. Péron